Tread surface and periphery of a footwear unit sole



FIG. 1 is a bottom plan view of a tread surface and periphery of a footwear unit sole showing our new design;

FIG. 2 is a left elevational view thereof;

FIG. 3 is a right elevational view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a left elevational view of a second embodiment of a tread surface and periphery of a footwear unit sole showing our design;

FIG. 7 is a right elevational view of the second embodiment;

FIG. 8 is a rear elevational view of the second embodiment;

FIG. 9 is a left elevational view of a third embodiment of a tread surface and periphery of a footwear unit sole showing our design;

FIG. 10 is a right elevational view of the third embodiment;

FIG. 11 is a front elevational view of the third embodiment; and,

FIG. 12 is a rear elevational view of the third embodiment. 

The ornamental design for a tread surface and periphery of a footwear unit sole, as shown and described. 